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Note 8 - Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
2018
   
December 31,
2017
 
Raw materials
  $
4,569
    $
3,424
 
Work in process
   
1,291
     
791
 
Inventory consigned to others
   
68
     
64
 
Finished goods
   
931
     
687
 
Total inventories
  $
6,859
    $
4,966